V4L/DVB (5229): Gl861: use qt1010_tuner_attach function from qt1010.h

The gl861_tuner_attach function is not specific to this device.
This patch removes gl861_tuner_attach, and replaces it with
qt1010_tuner_attach from the qt1010 header file.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>